1. Supporting combustion
   - comburant, combustive

See also: combustible

• unobserved
• unobserved fire
• unobstructed
• unobtainable
• unobtrusive
• unobtrusively
• unobtrusiveness
• unobvious
• unoccupied
• unoffending
• unofficial
• unofficially
• unoiled
• unopen
• unopened
• unopposable
• unopposed
• unordered
• unorganised
• unorganized
• unoriented
• unoriginal
• unoriginality
• unoriginally
• unoriginated